Oil-burner.



P. 01 JOHNSON.

OIL BURNER.

APPLICATION FILED APR. 26. 1916.

Patented May 8, 1917.

3 SHEETS-SHEET I jhuefozor P/ZLZLpD c/ZJ/Z/ZoW/L P. D. JOHNSON.

OIL BURNER.

APPLICATION FILED APR.26,1916.

Patented May 8, 1917.

3 SHEETSSHEET 2 P. D. JOHNSON.

OIL BURNER.

APPLICATION FILED APR.26.1916.

Patented May 8, 1917.

3 SHEETS-SHEET 3 PHILIP D. JOHNSON, OF CHICAGO, ILLINOIS, ASSIGNOR 0F GIVE-HALF TO CHARLES A. BROWN, 0F HINSDALE, ILLINQIS.

OIL-BURNER.

meagre;

Specification of Letters Patent.

l atented May 8, 1931?.

Application filed Apri126, 1916. Serial No. 93,577.

useful Improvement in Oil-Burners, of

which the following is a full, clear, concise, .and exact description, reference being had to the accompanying drawings, formin a part of this specification.

' y invention relates to oil burners.

Burners of this type generally employ an auxiliary or pilot burner to maintain the vaporizer o the main burner at the proper vaporizing temperature. The pilot burner on account of being of small size and on account of being at all times in service is subject to clogging and stopping up. It is desirable that the pilot burner be made conveniently removable, especially as to those parts of the burner which are likely to be clogged up. It is desirable that the pilot-vaporizer be removable at the front end of the main burner. It is also desirable that the vaporizer of the pilot h'rner be made of simple and inexpensive construction so that the same maybe renewed in whole or in part at a minimum expense.

My invention aims to embody the above and other desirable features. My invention in addition provides an automatic safety shut-off value which prevents the leakage of oil in case the pilot flame is blown out.

In the accompanying drawings which form a part of the present specification T have illustrated one manner in which my invention may be practised.

Figure 1 is a top plan view of the burner with the auxiliary or pilot burner;

Fig. 2 is a front elevational view on an enlarged scale, with respect to Fig. 1, of the main and auxiliary burners;

Fig. '3 is a sectional view taken on lines 3, 3, of Fig. 1, looking toward the front;

Fig. 4 is a fragmentary vertical sectional view showing the main and pilot burner nozzles in side elevation;

Fig. 5 is a longitudinal section of the pilot vaporizer and nozzle; and

Fig. 6 is a fragmentary view illustrating a modification.

Fig. 7 is a fragmentar isometric view of the outer end of one o the mixing tubes showing the lip 45.

As shown in Fig. 1 the main burner casting 1 which is circular in outline is provided with a plurality of ridges 2 which are slotted transversely to form suitable openings for discharging the combustible gases. A heating and vaporizing coil 3 enters the rear of the burner shell 4, as shown at '5, then forms a suitable convolution upon the inside of the fire box which is defined by the burner casting 1 and the shell 4. The end of the vaporizer tube 3 projects out radially to the front of the casing 4 through a suitable notch 6, as shown in Fig. 3, and has its outer end closed by a suitable plug or stud 7 which may be withdrawn for the purpose of removing scale, carbon and the like from the adjacent end of the tube. A pair of tubes 8 and 9 are welded to each other and to the tube 3. These tubes are joined at an angle to the portion 10 of the tube 8 and hear at their outer ends suitable tip castings 11 and 12 which are provided with cleaning screws 13 and 14 in line with the axes of the tubes 8 and 9. Suitable tips or jets 15 are provided at right angles to the bore of the tube, and suitable cleaning screws 16 are provided in line with the tips 15. The tips 15 are provided with a small bore which is partially closed by means of the wire 17, similar to that shown in Fig. 5. The wires 17 are secured to the cleaning screws 16 and suitable adjustment of the size of the flame may be made by filing down the wire 17 so as to leave the proper amount of opening between the bore of the tip and the wire.

The tips 15 discharge into suitable mixing tubes 20. The mixing tubes 20 have their outer ends cut off with a lip 45 projecting forward. This lip is to'prevent the drawing of an excessive amount of air from the vicinity of the pilot burner mixing tube 21. The outside part of the tubes 20 is cut away to facilitate the drawing of air from the outside. The outer end 10 of the tube 3 is joined as by welding to the plate 22 which lies over the slot 6 in such position as to close the same off. The plate 22 has a suitable aperture therethrough embracing the in position to hold the pilot vaporizer and burner in position. A supporting ring 28, shown in Figs. 1 and 3, supports the inner end of the tube 25. The ring 28 is secured to the adjacent part 10 of the vaporizer tube 3, as by welding.

The pilot burner casting comprises a hollow diamond shaped block which lies in the depression between two adjacent ridges below the main vaporizer tube 10, and the pilot vaporizer tube 25.

The tube 25 has its outer end closed by a plug 30, which is preferably conical or pointed to facilitate insertion into the ring 28. At the outer end the tube 25 has an enlarged portion 31 which is threaded internally. The enlarged portion 31 has connected therewith the depending nozzle portion 32 which communicates with the interior of the tube 25. The nozzle portion 32 is provided with a suitable tip 33 which communicates with the interior of the casting 34. A cleaning screw 35 is secured in the casting 34c axially in line with the bore of the nozzle 32. The cleaning screw 36 lies at right angles to the bore of the tube 32 and in line with the tip 33. A wire 37 is secured to the inner end of the screw 36 and this 'wire passes through the opening in the tip 33. The function, of the wire is both to permit cleaning of the tips to be readily accomplished and also to adjust the size of opening in the tip. The wire 37 is filed down-to secure the proper opening in the tip 33 to maintain suflicient volume of flame at the pilot burner to maintain the main vaporizer in suitable condition to initiate operation of the main burner at any time. A short nipple 38 which has connected to it a tube 39 of small bore is screwed into the open end of the enlarged portion 31 of the vaporizing tube 25; The small bore tube 39 is adapted to convey the oil or other liquid fuel into the vaporizer tube 25 where it is subjected to the heat of the pilot burner. A suitable needle valve 40 is secured to the nipple 31. The needle valve 40 is provided with a suitable valve handle 41 for controlling the fuel fed to the pilot vaporizer. A supply tube, which is not shown in the drawings, is connected to the depending part d2 of the valve casing.

It is apparent that the liquid fuel which is supplied through the valve 40 passes into the inner tube 39 from which it is discharged into the outer tube 25. v porization occurs and the vapor passes down through the nozzle 32, passes out of the tip 33 into the mixing tube 21 and thence through the pilot burner 29 into the fire box where combustion occurs. It will be noted that the two concentric tubes 39 and 25 are subjected to different degrees of heating during the operation of the burner. In Fig.

6 I have shown a modified arrangement in In the tube 25 which the plug 30 is provided with an interior conical face t5 which is adapted to close the opening in the end of the inner tube 39 in case the pilot flame should be blown out. It is apparent that the inner tube 39 is heated to a less degree than is the outer tube 25. In addition the oil tends to keep the inner tube 39 cooler. In case the pilot flame is blown out the outer tube 25 cools off more quickly than does the inner tube 39 and shuts off the opening in the end of the tube 39. This prevents the danger of leakage of oil which would otherwise occur. When it is desired to light the pilot burner the outer tube 25is heated and this automatically opens up the end of the tube 39 so that when this tube is sufficiently 'hot the fire may be started and theend of the tube thus maintained open. that this arrangement provides an automatic valve for shutting off the flow of fuel in case the pilot flame is blown out or otherwise accidentally extinguished.

I claim:

1. In combination, a main burner casting, a main vaporizer tube extending over said casting, a pilot burner below said vaporizer tube, a ring secured to said vaporizer tube, a pilot vaporizer comprising a pair of concentric tubes, the outer tube having its inner end closed and adapted to be inserted in said ring, and means to supply liquid fuel to the inner one of said concentric tubes.

2. In combination, a main burner, a casing surrounding said burner, a main vaporizer tube extending over said burner and projecting out of said casing a ring rigidly secured to saidvaporizer tube, a pilot burner beneath said vaporizer tube, a pilot vaporizer comprising a tube having a closed end adapted to project through said ring and means for feeding liquid fuel to the interior of said pilot vaporizer tube adjacent said closed end.

3. In combination, a main burner, a casing surrounding said main burner, a vaporizer tube for said main burner projecting through the front of said casing, a ring rigidly secured to said vaporizer tube,- a pilot burner below said vaporizer tube, a pilot vaporizer tube having its inner end closed, the inner end of said pilot vaporizer tube being supported in said ring, a plate secured to the outer end of said pilot vaporizertube, and means for securing said plate to said burner casing.

4. In combination, a main burner, a casing surrounding said main burner, said casing having a. slot in the upper end thereof, a vaporizer tube above said main burner, said tube having its end lyin in said slot, a plate secured to said vaporlzer tube, said plate having an aperture therethrough, a pilot burner vaporizer tube having its inner end closed, a plate secured to the outer end It can be seen box, a burner in said shell, a vaporizer for said burner, said vaporizer comprising a pair of concentric tubes projecting into said fire box, said outer tube having its inner end closed, a plate forming a flange about said outer tube, said plate being secured to said shell, a nozzle opening into said outer tube at its outer end, and means for supplying liquid fuel to said inner tube.

6. In combination a shell defining a fire box, a burner in said shell, a vaporizer for said burner, said vaporizer comprising a palr of concentric tubes. pro]ect1ng lnto sald fire box, said outer tube having its inner end closed, means secured to said outer tube for supporting said vaporizer from said shell, a depending nozzle secured to said outer shell outside of said supporting means, said nozzle being in communication with said outer tube, and means for supplying liquid fuel to said inner tube.

7. In combination a shell defining a fire box, a burner in said shell, a vaporizer for said burner, said vaporizer comprising a pair of concentric tubes projecting into said fire box above said burner, a plug closing the inner end of said outer tube, said plug having a conical seat, said inner shell being adapted to cooperate with said conical seat to form a thermostatic valve, a nipple mounted in the open end of said outer tube, said inner tube being connected to said nipple, supporting means secured to said outer tube, said supporting means being adapted to support said vaporizer from sa d shell, and a depending nozzle for sa d burner, said nozzle communicating with said outer tube.

8. A vaporizer comprising a pair of concentric tubes, a plug closing the inner end of said outer tube, a nipple secured in the open end of said outer tube, said inner tube being connected to said nipple, a depending nozzle secured to said outer tube and communicating therewith, a valve casing connected to said nipple and a valve having a threaded valve stem lying axially in line with said tube, said valve having an inlet at substantially right angles to the axis of said tube.

tubes secured together at one end, a plug for the opposite end of said outer tube, a seat adapted to be engaged by the end of said inner tube to form a thermostatic valve, means for supplying fluid fuel through said inner tube, and a burner below said pair of tubes, said burner being supplied with fuel through said outer tube.

10. In combination, a source of liquid fuel supply and a burner, a pair of concentric tubes one communicating with said source of fuel and the other with said burner, the burner being located beneath the tubes to heat the same, the outermost tube being subjected to greater heat than the inner tube, a plug in one end of the larger tube havinga seat engageable with the open end of the smaller tube, whereby when the burner is blown out the larger tube contracts more rapidly than the inner tube in cooling to close communication through the smaller tube.

In witness whereof, I hereunto subscribe my name this 22nd day of April A. D. 1916.

a PHILIP D. JOHNSON.

9. In combination, a pair of concentric 

